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Rob-
One thing a space elevator could do is allow us to reach the moon quickly and easily. on the moon there is a huge supply of He3 (i think that's what it is) which is used for fusion. that would provde a cheap, clean power source for many years to come. also, the problem of over crowding could be eliminated. if mars was to be colonized, a large portion of earth's population could be moved, and this would help greatly. i do agree with your concern, but this is something that may not have benifits the second it's built , but i think as time goes on it will become more and more important.
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